A viral disease of broad bean caused by a non‐aphid‐transmissible strain of turnip mosaic virus

Abstract

A viral disease of broad bean (Vicia faba) was observed in Jiangsu, Zhejiang and Sichuan Province, the People's Republic of China. Its typical symptom on infected leaves was a white mottle, and, rarely, red necrotic lesions on several broad bean cultivars. A non‐aphid‐transmissible strain of turnip mosaic virus (TuMV) was identified as the causal agent of the disease on the basis of biological properties, particle morphology, seed and aphid transmission and serological tests. The virus could not be transmitted by aphids in the non‐persistent manner.

The genetic structure of populations of Turnip mosaic virus in Kyushu and central Honshu, Japan

“…It is possible that TuMV has been introduced to Japan in infected seed although there is no record of seed transmission, but there are some reports on the occurrence of TuMV in broad bean, saffron and Allium sp. (Hu et al 1996;Chen and Chen 2000;Gera et al 1997). Another alternative would be metapopulation events involving colonization and extinction, as reported for several other plant viruses (García-Arenal et al 2000;Tsompana et al 2005).…”

A phylogeographical study of theTurnip mosaic viruspopulation in East Asia reveals an ‘emergent’ lineage in Japan

“…TuMV is transmitted by aphids in a nonpersistent manner but there is no record of seed transmission (Provvidenti 1980) although several potyviruses are. However, the occurrence of TuMV in broad bean ( Vicia faba ) and in saffron ( Crocus sativus ) in China (Hu et al . 1996; Chen & Chen 2000), in Allium ampeloprasum in Israel (Gera et al .…”

“…TuMV is transmitted by aphids in a nonpersistent manner but there is no record of seed transmission (Provvidenti 1980) although several potyviruses are. However, the occurrence of TuMV in broad bean (Vicia faba) and in saffron (Crocus sativus) in China (Hu et al 1996;Chen & Chen 2000), in Allium ampeloprasum in Israel (Gera et al 1997) and in Ranunculus (Ranunculus asiaticus) in Italy (Tomimura et al 2004) indicates that the host reactions of TuMV, including its ability to be seed-borne, may need to be re-examined. The other alternative would be metapopulation events involving colonization and extinction as has been reported for several plant viruses including CMV, tobamoviruses and TSWV (Fraile et al 1997;García-Arenal et al 2000, 2001Tsompana et al 2005).…”

The hallmarks of “green” viruses: Do plant viruses evolve differently from the others?

“…The ability to be transmitted exerts an obvious selection pressure on virus populations. Nontransmissible isolates are not expected to spread efficiently, although such isolates can sometimes develop epidemics at a moderate geographic scale, probably through assistance mechanisms with transmissible strains or viruses (Hu et al, 1996;Yakoubi, Desbiez and Lecoq, unpublished). When the selection pressure for vector transmissibility is lowered (repeated mechanical inoculations, vegetative propagation of the host, long-term maintenance in insect cells for viruses that multiply in Version définitive du manuscrit publié dans / Final version of the manuscript published in : Infection, Genetics and Evolution, 2011,11, 812-824.…”